CAJ | 학술논문

柽柳是分布广泛的耐盐耐旱植物,温带干旱区重要物种.观测证明柽柳冠下有机凋落物的沉积作用是显著的,具有有机碳沉积埋藏的重要意义.有机质凋落沉积量与柽柳当年生长量关系不密切,但受当地水分条件、气温变化和风沙作用影响显著.在策勒绿洲前缘,柽柳冠下有机质凋落物年沉积量达到400g/m2.当多枝柽柳冠丛受到损伤或生长受到胁迫时,沉积明显增加,年生长量与凋落量之比(回归量)>40%;在时间序列上,有机凋落物与无机碎屑的主要沉积过程是明显分开的,有机凋落物沉积主要发生在冬季,占年沉积量的75%以上,而同期无机碎屑沉积量不足5%.沉积交替过程对有机凋落物形成了良好的埋藏保存作用;在空间范围上,有机凋落物并不是在冠下均匀或对称分布的.在风的影响下,冠丛下风侧有机凋落物被显著集中.冠丛丘的顶部只是无机碎屑的沉积中心区而并非有机凋落物.
정류시분포엄범적내염내한식물,온대간한구중요물충.관측증명정류관하유궤조락물적침적작용시현저적,구유유궤탄침적매장적중요의의.유궤질조락침적량여정류당년생장량관계불밀절,단수당지수분조건、기온변화화풍사작용영향현저.재책륵록주전연,정류관하유궤질조락물년침적량체도400g/m2.당다지정류관총수도손상혹생장수도협박시,침적명현증가,년생장량여조락량지비(회귀량)>40%;재시간서렬상,유궤조락물여무궤쇄설적주요침적과정시명현분개적,유궤조락물침적주요발생재동계,점년침적량적75%이상,이동기무궤쇄설침적량불족5%.침적교체과정대유궤조락물형성료량호적매장보존작용;재공간범위상,유궤조락물병불시재관하균균혹대칭분포적.재풍적영향하,관총하풍측유궤조락물피현저집중.관총구적정부지시무궤쇄설적침적중심구이병비유궤조락물.
Tamarix is widely distributed in the transitional zone between oasis and desert.The Cele National Field Observation Station for Desert Grassland and Ecosystem(Cele Station)at the western edge of the Cele artificial oasis was selected for this study.Tamarix grows with sand deposition and a Tamarix cone is formed.The growth of Tamarix cone is a process of soil carbon accumulation.We choose five Tamarix cones named A,B,C,D,and E in the station.We have counted the growth amount of the shrub and collected the litter-fall under the shrub to study the deposition of the litter-fall under Tamarix shrubs.Observations prove that the sedimentation of organic litter under Tamarix shrub is obvious and important for the burial of organic carbon.The relationship of the deposition of organic litter and growth of Tamarix is not closely related,but it is obviously affected by the local water conditions,temperature changes,and the wind and sand.The deposition of organic litter under Tamarix shrubs in the front of the Cele Oasis reaches 400g/m2.When the shrub of Tamarix ramosissima is injured or has growth pressure,the deposition increases obviously,and the ratio of annual growth to litter quantity will be more than 40%.In time series,the main deposit process of the organic litter and inorganic debris is clearly separated.The deposition of organic litter occurs mainly in winter,accounting for more than 75% in annual deposition,while inorganic deposition is less than 5% in the same period.The alternating deposition process forms a good preservation and burial of the organic litter.Spatially,the distribution of organic litter is not uniform nor symmetrical under the coronal of the Tamarix shrub.With influence of the wind,the organic litter mainly on the lee of the shrub.The top of the shrub cone is the deposition center of inorganic clasticmateriai rather than of organic litter.